Filter bag attaching means for dust arresting apparatus



Nov. 27, 1951 RUEMEUN 2,576,310

FILTER BAG ATTACHING MEANS FOR DUST ARRESTING APPARATUS FiledSept. 24, 1949 IN VEN TOR.

h m/zh mw Patented Nov. 27, 1951 FI-L'PEB- BAG ATTACHING' MEANS Fort nns'r ARRESTING APPARATUS This invention relates tov improvements in filter bag attaching means for dust arresting an.- a els.

Dust arresting devices. as commonly constructed. include. a collecting box into which the dust laden. air is blown, and a plilrality of filter bags having their lower ends communicating with openings in the top wall of said box. During use, the heavy particles .of matter in the air, readily settle in the. collector box, and the finer particles oi dust passup into. the filter bags and are deposited on the side. of the cloth. This dust within the bags is. periodically shaken down into the collector box, usually. by a mechanical shaking device.

It has, heretofore, been common practice to clamp. the lower ends of the filter bags around collars which su-rronnd' the top. openings in the collector box and which project upwardlytherefrom, .and these collars, being numerous and close together, render the task of cleaning the top. side of; the collector boxvery .difiicult, The spaces bet-ween collars are narrow and relatively -ma,coessible, and the cost can not b swept int the collector box openings. b cause the collars interfere. This clamping method also renders the task; o remo ng the. bags. rela vely e fi ac the s o he, o en ngs nrotc .si Yr, a mig t be cl s recln. addition. th cons io of hi Prior pat nt. i 2.

mm of engagement. 7

Inns: a o icc o nresent invent n v ways simple to snap the rings into a propert es;-

te P ov e im cr d g means cra'i ivre is sc an were 243 11.39 i on the cnstr ctio -is sim lifie tcrodncccrrcc e o nuts tore.-

A.. flutt r-ob ect or e tion 1.5120 ovid a constru tion abo e desc ibed which a si gl ecmmame r n ma b s ccessic yem- ;nl yed at, t lower nd o ach filter eani ar cement belts such to ie nta .nr ecr e ga em nt o th o e and of he ba withou dan er oi th rin crepts Past a cons ruction as above described wh r in. he-

canse or the difference in diameter of an annular led e pen n as compared to the diameterof th adjacent opening in the collector box wall. thfi cloth of the filter bag is given greater protection against Wear from abrasive action thereon.

With the above and other objects in View, th invention consists of the. improved filter bag attaching means, for dust arresting apparatus, and all its parts and combinations, as set forth in the claims, and all the equivalent thereof.

In the accompanying drawing, illustrating one complete embodiment, of the preferred form of the invention, which the same reference ,nu morals, designate the same parts in all the views:

Fig, 1 is a side- -yiew of a portion of a dust arrester showing a series of filter bags extending upwardly from a dust collector 1008;

Fla :2 is a fragmentary vertical section view on an enlar ed scale showin the e gagement f t e. lower en f a fil er ba w th th o e n hcytonival th collect r box;

Fi 3 a new sim a to Fig. 2 showin a fragment of the bag retaining means on an enintendca e;

ie. 4 a. Plan .o t e dciqrn ah e rin a view im la to, Fis- .3 showi g a c n.

' st r ins more os iicelarl to. the drawin th 8 d si nate t bu a .fi ter bas o me 9?: suitab e tct l ci ie ial wh c ha bc nzs e all woven to us in dust arre ters. A m ltiplicity of bags is usually employed with the bags en mies-in ntro di e ons.-

' ow r en s of the :iilte ba s are connected 's antiallv ir ar f rm- .Above theexpansion of each filter bag is a deformable ring 22.

ammo

, looped over one of the bag hanging hooks IS, the

shanks of the bag hanging hooks extending through openings in a flange M of a shaking angle member l5, and the upper ends of the shanks being engaged with eyes It in hanging bars l1.

During use of this type of device it is common practice to apply reciprocating motion to the shaking angles I5 to cause shaking of the upper ends of the filter bags. This dislodges fine particles of dust which have been deposited on the inner walls of the filter bags and causes said particles to fall back into the collector box, it being understood that in this type of device they ,large amount of dust is deposited on the top wall I8 of the collector box exteriorly of the filter "bags; Where collars are employed, this dust lodges in the narrow spaces between collars.

Thus, when the lower ends of the filter bags are disconnected as is necessary from time to time,

-it has not been possible, with the type of construction utilizing a collar, to merely sweep the dust into the openings because the collars interfere. With the present invention and with the construction of prior Patent 2,308,309, no external-collars are employed, and when it is nec- .essary to clean the top wall N3 of the collector {box the lower ends of the filter bags can be disconnected and the dust swept directly into the openings 9. p With the construction of the beforementioned gprior patent, more effort was required to disconnect and connect the lower ends of the multiplicity of bags than was desirable because of the fact that two rings are employed, it being dinicult to make each ring snap into its proper position.

With the present invention, the lower end of each filter bag has a doubled back portion forming a loop .1 formedby a separate doubled back piece of ma- 'terial 20 stitched to the lower end of each bag as l9 in cross-section. This may be at12I. The material 20 may be of a different nature than the material of the filter bags proper -soas to have greater resistance to tearing and cutting and may, if necessary, be reinforced on the outer side; where there is contact with the edges of the openings 9, with leather or any other suitable material.

Confined within the loop l9 at the lower end In the preferred form of the invention the ring is formed of a coil spring as illustrated in Fig. 4, which spring normally holds itself with considerable tension in a circular condition, the spring, however, being readily deformable by pressure of the hand. The ring-22 is of greater external diameter than the opening 9 in the top wall of the collector box.

i In order to form a suitable pocket for the ring claims.

corner 25, the diameter of the corner portion being greater than the diameter of the hole 9 in the top wall. The other portion 26 of each angular ledge forming member extends substantially horizontally from the annular corner portion 25 and projects inwardly to its marginal edge 21, which marginal edge has a diameter substantially less than the diameter of the hole 9 in the collector'box wall.

To connect the lower end of a bag, the ring 22 is deformed to permit its insertion through an opening 9. Due to the fact that the ledge 26 projects inwardly a substantial distance beyond the margin of the opening 9, there is no danger of the ring snapping all the way through past the ledge. Instead, the ring hits the upper surface of the annular ledge 26 and readily snaps into the position shown in Figs. 2 and 3. Due to the angle of the portion 24 of each ledge forming member, the ring 22 wedges itself into sealing position to prevent leakage of dust to the exterior.

By having the marginal edge 27 of each ledge forming member project inwardly a substantial distance from the margin of the hole 9, all of the dust laden air passes upwardly in a circular stream Whose diameter is limited to substantially the diameter of the portion 27. Inasmuch as this air stream contains abrasive particles, thisarrangement keeps the entering air away from the sides of the filter bag until it has passed upwardly a substantial distance and until its velocity has been reduced to a point where there is less wear on the filter bag.

In the modification of Fig. 5 the annular ledge forming member 23' extends at an oblique angle with respect to the top wall l8 and projects inwardly where it has an opening 21. At said opening the materialis flared angularly outwardly and downwardly as at 39 to provide a skirt portion. It is to be noted that the diameter of the opening 21' is substantially less than the diameter ofthe hole 9 in the collector box wall just as the marginal edge 21 of the form of the invention of Fig. 3 is of less diameter than the diameter of the hole 9.

With the arrangement of the modification, should the bag be inserted downwardly beyond the annular restricted portion which surrounds the opening 21, then by exerting an upwardpull, the flared skirt 39 will guide the ring-equipped lower end of the bag into the position shown by the dot and dash lines in Fig. 5, where, in response to a further pull, it can snap past the annular restricted portion 21' and intoproper position in the pocket, as indicated by full lines in Fig. 5.

Various changes and modifications may be made without departing from the spirit of the invention, and all of such changes are contemplated as may c'ome' within the scope of the WhatIclaimis: 1'. Attachment means for connecting a vertically extending tubular filter bag toa receptacle comprising a substantially horizontal receptacle wall portion extending transversely of the axis of the filter bag when the latter is attached, said wall portion having an opening therein; a ledge forming member surrounding said opening on the lower face of said wall portion to provide an annular pocket outwardly of the margin of the opening and including an annular portion which projects inwardly toward the axis of the opening in-the receptacle wall, said annular portion of the ledge forming member having an opening which is of substantially less diameter than the diameter of the opening of said receptacle wall, said ledge forming member having a portion flared downwardly and outwardly from its opening to provide an annular skirt, and a deformable ring secured to the margin of the filter bag, said ring being normally of greater diameter than the opening of the receptacle wall, and said ring be positionable in said pocket to attach said filter bag to said receptacle. 7

2. Attachment means for connecting a vertically extending tubular filter bag to a receptacle comprising a substantially horizontal receptacle Wall portion extending transversely of the axis of the filter bag when the latter is attached, said wall portion having an opening therein; a ledge forming member surrounding said opening on the lower face of said wall portion to provide an annular pocket outwardly of the margin of the opening and including an annular obliquely extending portion which projects inwardly toward 6 the axis of the opening in the receptacle wall, said annular portion of the ledge forming member having an opening which is of substantially less diameter than the diameter of the opening of said receptacle wall, said ledge forming member having a portion flared downwardly and outwardly from its opening to provide an annular skirt, and a deformable ring secured to the margin of the filter bag, said ring being normally of greater diameter than the opening of the receptacle wall, and said ring be positionable in said pocket to attach said filter bag to said receptacle.

RICHARD RUEMELIN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,083,408 Matchette Jan. 6, 1914 2,308,309 Ruemelin et a1 Jan. 12, 1943 

